Abstract: A multi-functional curved board used as a support for legs of a user and for general maintenance of muscle strength, the multi-functional curved board having one or more curved bodies (1) including a radius of curvature, a longitudinal axis, and at least one raised foot support. The multi-functional curved board can be bent in the direction transverse to the radius of curvature to enable the multi-functional curved board to rotate around the longitudinal axis.

Abstract: A multi-functional curved board to be used when working in standing position and for working when sitting down as a support for feet and generally for maintaining muscle strength, the multi-functional curved board having at least one curved body (1). The body (1) comprises at least one counter-curve means (3). One surface (1b) of the body is curved outwards and the counter-curve means are fastened to a surface (1a) opposite this surface (1a) adjacent the end sides (1d) of the body (1) and the counter-curve means are curved outwards from the opposite surface of the body (1).

Abstract: The present invention relates to a method for manufacturing a musical instrument, in which method a musical instrument is manufacturing for one or several parts and of which parts at least one part is manufactured of plastic material compound, which includes thermoplastic polymer. The present invention relates also to a musical instrument, which instrument has been manufactured of one or several parts and of which parts at least a part has been manufactured of plastic material compound, which includes thermoplastic polymer. Characteristic to the method in accordance with the invention is the fact that plastic material compound is made by mixing natural fibers to thermoplastic polymer and that a musical instrument or its parts are manufactured of plastic material compound by injection moulding such that the natural fibers in plastic material compound are directed mainly in certain, desired direction in respect of the musical instrument or its part while moulding.

Abstract: The present invention relates to a method for manufacturing a musical instrument, in which method a musical instrument is manufacturing for one or several parts and of which parts at least one part is manufactured of plastic material compound, which includes thermoplastic polymer. The present invention relates also to a musical instrument, which instrument has been manufactured of one or several parts and of which parts at least a part has been manufactured of plastic material compound, which includes thermoplastic polymer. Characteristic to the method in accordance with the invention is the fact that plastic material compound is made by mixing natural fibres to thermoplastic polymer and that a musical instrument or its parts are manufactured of plastic material compound by injection moulding such that the natural fibres in plastic material compound are directed mainly in certain, desired direction in respect of the musical instrument or its part while moulding.